First of all, sorry for my bad english!

I love your mod, was searching so long for a good mod with just a bossfight for my modpack and this is my final boss!

But there are some thinks I would like to see:
-Performance eater.
With all this fireballs and lightnings, its really a big performance eater in a modpack. My suggestion is maybe to lower the boom-boom rate or no idea. Of course if possible...
-Config for loot. This is something I really need in your mod. I would like to be able to delete your Items maybe from the config and add something else. I have so much strong custom items and even baubles.... This will be a dream for every modpack developer.
-Maybe a config file for the mobs Herobrine can spawn. Like not just ghast, maybe even add some zombies...
-And a config for health, spawnrate(ghasts), damage, lightningrate, fireballrate would be nice too!

I know, it's a lot. No idea how hard it is, it's just what would make me happy. But after all, I love your mod a lot! Good job!

Thanks for your suggestions! I'll definitely look into them. For the current version, I just wanted to lay the groundwork for the fight - what's currently in the mod is just representative of what I want the fight to be, and isn't necessarily balanced. I like the idea of a very configurable fight and that's definitely something I'll look into but keep in mind the final phase isn't even fully done, so that'll be my first priority :)

Leaving this open so I don't forget about it.

It's worth noting, you can use the mod LootTweaker to customize the loot drops for any mob, including modded ones. (It also lets you alter the loot tables for dungeon chests and the like). There's plenty of documentation online.

https://www.curseforge.com/minecraft/mc-mods/loottweaker

+1 for high configurability in general though.

Ah good shout on LootTweaker!